14.2.Â Terms Related to Jails

To facilitate better understanding of parts of the FreeBSD
system related to jails, their internals and the way they
interact with the rest of FreeBSD, the following terms are used
further in this chapter:

The environment of processes running in a
“chroot”. This includes resources such as
the part of the file system which is visible, user and
group IDs which are available, network interfaces and
other IPC mechanisms, etc.

The system administration utility which allows
launching of processes within a jail environment.

host (system, process, user, etc.)

The controlling system of a jail environment. The
host system has access to all the hardware resources
available, and can control processes both outside of and
inside a jail environment. One of the important
differences of the host system from a jail is that the
limitations which apply to superuser processes inside a
jail are not enforced for processes of the host
system.

hosted (system, process, user, etc.)

A process, user or other entity, whose access to
resources is restricted by a FreeBSD jail.